Sets with nils using SetElement(s)

> i added a changesets into a corresponding tracker issue (#1907)
>
> please, be advised, that in Squeak it was adopted after
> HashedCollection refactoring.
> And a scope of changes is wider than my own (it includes KeyedSet and
> KeyedIdentitySet, which i haven't touched before).
>
> Still, all tests are green,
> except there is unimplemented #errorNoFreeSpace , which can be found
> in trunk's HashedCollection ).
>
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>
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